bootstrap: create stdio file descriptors for use by other tasks

sys/bootstrap/main.c

@@ -5,11 +5,13 @@
 
 #include <fs/allocator.h>
 #include <fs/context.h>
+#include <fs/file.h>
 #include <heap/heap.h>
 #include <launch.h>
 #include <mango/handle.h>
 #include <mango/log.h>
 #include <mango/msg.h>
+#include <mango/object.h>
 #include <mango/task.h>
 #include <mango/types.h>
 #include <pthread.h>
@@ -90,6 +92,45 @@ static void _fs_free(struct fs_allocator *alloc, void *p)
 	heap_free(alloc->fs_arg, p);
 }
 
+static enum fs_status std_write(
+	struct fs_file *f,
+	const xpc_buffer_t *buf,
+	size_t count,
+	off_t *seek)
+{
+	char data[1024];
+	xpc_buffer_read(buf, 0, data, sizeof data, NULL);
+	if (count > sizeof data - 1) {
+		count = sizeof data - 1;
+	}
+
+	data[count] = 0;
+	if (data[count - 1] == '\n') {
+		data[count - 1] = 0;
+	}
+	kern_log(data);
+
+	*seek += count;
+	return FS_SUCCESS;
+}
+
+static const struct fs_file_ops stdio_ops = {
+	.f_write = std_write,
+};
+
+static void create_stdio(struct fs_context *ctx, kern_handle_t out[3])
+{
+	for (int i = 0; i < 3; i++) {
+		port_create(&out[i]);
+		kern_object_info_t info;
+		kern_object_query(out[i], &info);
+		struct fs_file *file = fs_context_open_file(ctx, info.obj_id);
+		fs_file_set_ops(file, &stdio_ops);
+
+		port_connect(out[i], 0, 0);
+	}
+}
+
 int main(
 	int argc,
 	const char **argv,
@@ -163,17 +204,6 @@ int main(
 	launch_ctx_init(&launch);
 	launch.ctx_resolve_library = resolve_dependency;
 
-	enum launch_status status
-		= launch_ctx_execute(&launch, &params, LAUNCH_F_NONE, &result);
-	if (status != KERN_OK) {
-		kern_logf("failed to start init: %d", status);
-		return -1;
-	}
-
-	kern_handle_close(result.r_task);
-	kern_handle_close(result.r_thread);
-	kern_handle_close(result.r_address_space);
-
 	heap_t heap = HEAP_INIT;
 
 	struct fs_allocator fs_allocator = {
@@ -190,6 +220,19 @@ int main(
 		return -1;
 	}
 
+	create_stdio(fs, params.p_stdio);
+
+	enum launch_status status
+		= launch_ctx_execute(&launch, &params, LAUNCH_F_NONE, &result);
+	if (status != KERN_OK) {
+		kern_logf("failed to start init: %d", status);
+		return -1;
+	}
+
+	kern_handle_close(result.r_task);
+	kern_handle_close(result.r_thread);
+	kern_handle_close(result.r_address_space);
+
 	fs_context_set_channel(fs, channel);
 	enum fs_status fs_status = fs_context_mount_filesystem(
 		fs,